Why can't Unicom broadband primary and secondary cards send text messages to other accounts?

Unable to send SMS, it is suggested to check it in the following way: 1. The mobile phone is in arrears or has insufficient balance. It is suggested to check whether it is arrears or insufficient balance first. If you owe money or the balance is insufficient, please pay and try again. 2. Being restricted by sending short messages frequently or sending sensitive keywords (pornography, fraud, political short messages). 3. Check whether the SMS function is turned on normally. 4. The SMS center number is wrong, so you need to set the SMS center number. Due to the different number of SMS centers in different provinces, it is recommended to contact the operator's customer service for inquiry. 5. There is something wrong with the mobile phone terminal. It is recommended to try again at another terminal. If the SMS cannot be sent after the above methods are checked, please contact the operator's customer service for verification.